import React, { Component } from 'react';
// 引入store，获取redux中保存的状态
import store from '../../redux/store';
// 引入actionCreator，专门用于创建action对象
import { createIncrementAction, createDecrementAction, createIncrementAsyncAction } from '../../redux/count_action';

export default class Count extends Component {
    // state = { count: 0 };
    // componentDidMount() {
    //     // 监测redux中状态的变化，只要变化，调用render
    //     store.subscribe(() => {
    //         this.setState({});
    //     });
    // }
    // 加法
    increment = () => {
        const { value } = this.selectNumber;
        store.dispatch(createIncrementAction(value * 1));
    };
    // 减法
    decrement = () => {
        const { value } = this.selectNumber;
        store.dispatch(createDecrementAction(value * 1));
    };
    // 奇数再加
    incrementIfOdd = () => {
        const { value } = this.selectNumber;
        const count = store.getState();
        if (count % 2 !== 0) {
            store.dispatch(createIncrementAction(value * 1));
        }
    };
    // 异步加
    incrementAsync = () => {
        const { value } = this.selectNumber;
        // setTimeout(() => {
        store.dispatch(createIncrementAsyncAction(value * 1, 500));
        // }, 500);
    };
    render() {
        return (
            <div>
                <h1>当前求和为：{store.getState()}</h1>
                <select ref={currentNode => (this.selectNumber = currentNode)}>
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                </select>
                &nbsp;&nbsp;
                <button onClick={this.increment}>+</button>&nbsp;&nbsp;
                <button onClick={this.decrement}>-</button>&nbsp;&nbsp;
                <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;&nbsp;
                <button onClick={this.incrementAsync}>异步加</button>
            </div>
        );
    }
}
